Improvement in ore-stamps



UNITED STATES PATENT OFFICE.

THOMAS SOHOFIELD, 0F GRASS VALLEY, CALIFORNIA.

IMPROVEMENT IN ORE-STAMPS.

Specification forming part of Letters Patent No. 191,889, dated J one12, 1877; application filed March 24, 1877.

To all whom it may concern:

Be it known that I, THOMAS SoHoFIELD, of Grass Valley, in the county ofNevada and State of California, have invented a new and Improved QuartzBattery, of which the following is a specification Figure 1 is avertical section of my improved quartz-battery, taken on line as w inFig. 2. Fig. 2 is a plan view.

Similar letters of reference indicate corre sponding parts.

My invention consists in the combination of a ring supported and guidedby rollers, and carrying a number of cams, and a number of stamp-rodshaving collars that are engaged by the cams as the ring revolves.

The common method of crushing quartz by heavy cumbersome machinery, andthe difficulty experienced in conveying quartz from a considerabledistance to such machinery, has hitherto rendered the prospecting ofledges remote from quartz mills a laborious and troublesome matter.

To provide a portable and yet efficient quartz-battery, which may beworked by horses or other animals, and by them be drawn from place toplace, is the object of my invention.

Referring to the drawing, A is the bed of the machine, which, in thepresent case, is cross'shaped; but it may, if desired, be made in otherforms.

Posts a a project upward from the bed A, and to them are secured theadjustable supports b of the rollers c. The supports 1) are slotted toreceive screws, by which they are secured to the posts a.

B is a ring composed of Wood or iron, or a combination of both, thatrests upon the rollers c, and is guided by the flanged horizontalrollers d, which are journaled upon studs projecting upward from theadjustable castings e, that are secured to the tops of the posts a byscrews, that pass through slots in the'said castings and into the posts.To the upper surface of the ring 13, and near its inner edge, triangularlifting-cams f are attached.

0 O are the stamp-rods, that are guided in suitable boxes in curvedplates 9, that are supported by posts h. To the lower end of these rodsthe pestles which work on the mortars are attached, and upon them,between the plates g, the tappets i are placed in such position as to beengaged by the lifting-cams f as the ring B is revolved.

Sweeps D are attached to opposite sides of the ring B, to which horsesor other animals may be hitched to furnish the requisite power.

It will be seen that as the ring B revolves the tappets t are engaged bythe lifting-cams f, and are raised as the inclined sides of the camspass under the tappets, and are allowed to fall when the vertical sideof the cam passes the tappets.

Any desired number of stamping-rods may be employed, and two or moresweeps may be used, as circumstances may require.

Having thus described my invention, I claim as new and desire to secureby Letters Patent- The plain ring B, supported on bottom rolls a, guidedby flange side rolls (1, and having angular lifting-cams f on its inneredge, in combination with stamp-rods within the ring, and havingtappets, as shown and described, for the purpose specified.

THOMAS SOHOFIELD.

Witnesses:

0. P. THOMPSON, J. VAN HOETER.

